JPH06116119A - Cosmetic high in ultraviolet light-absorbibng effect - Google Patents

Abstract

PURPOSE:To provide the cosmetic excellent in its UV light-absorbing ability, reduced in its irritation against skins, good in spreadability, and little in the fading of colors. CONSTITUTION:This cosmetic high in its UV light-absorbing effect is characterized by compounding flaky glass containing 5-80wt.% of titania and 20-95wt.% of silica, the total content of the titania and silica being at least 80wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cosmetics, and more particularly to cosmetics having an excellent ultraviolet ray absorbing effect.

[0002]

2. Description of the Related Art In the field of women's cosmetics, ultraviolet rays cause skin pigmentation and cause spots and freckles.
There is a strong demand for cosmetics such as emulsions, foundations, creams, etc., which have excellent UV absorption capacity. Further, in recent years, the outdoor activities of leisure have become established, the time for outdoor activities is extended, the chances of being exposed to ultraviolet rays are increasing, and the demand for cosmetics that efficiently absorb ultraviolet rays is increasing.

In order to meet such demands, pigments such as mica, talc and sericite which are usually used in the production of cosmetics cannot be used. Therefore, cosmetics containing an ultraviolet absorbing material have come to be manufactured.

As the ultraviolet absorbing material, organic type ultraviolet absorbing agents such as benzotriazole type or benzophenone type and inorganic type ultraviolet absorbing agents such as titanium oxide or zinc oxide are known.

[0005]

The cosmetics containing an organic UV absorber such as a benzotriazole type or a benzophenone type have good UV absorbing properties,
Since the organic substance directly contacts the skin, there is a problem that the irritation is too strong and the skin is damaged. In addition, since the stability of the organic UV absorber is poor, there is a problem that the UV absorption property is significantly deteriorated when stored for a long time.

On the other hand, titanium oxide or zinc oxide,
Inorganic UV absorbers are inferior in UV absorbing ability to organic materials, but are widely used because they are safe and stable.

As such an inorganic pigment, ultrafine particles of 1 micron or less are usually used in consideration of the spread of cosmetics. In that case, there are problems in that the spread of the ultrafine inorganic pigments in the cosmetic material deteriorates and the spread of the ultrafine particles adsorbs moisture on the skin to reduce the whiteness (fading).

In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a cosmetic which has less irritation to the skin, spreads well, is resistant to fading, and has an excellent ultraviolet absorbing ability.

[0009]

In order to solve the above-mentioned problems, the present invention uses 5-80% by weight of titania and 2% of silica.
It is a cosmetic material having a high ultraviolet absorption effect, which contains 0 to 95% by weight of each of the flaky glass made of titania-silica-based glass and has a total content of titania and silica of at least 80% by weight.

The titania-silica glass referred to herein may be in the form of a composite in which titania fine particles are dispersed in silica glass or in the form of a multi-component glass in which titania and silica are uniformly mixed. By controlling the particle size of the above, a higher ultraviolet ray hiding effect can be obtained by utilizing the scattering on the surface of the titania fine particles, and thus the former (first) flake glass in the form of a composite is preferable. In that case, the average particle size of the titania fine particles is 10
nm to 1000 nm, more preferably 15 nm to 1
00 nm particles are used.

The composition of the titania-silica flake glass of the present invention is in the range of 5 to 80% by weight, more preferably 7 to 60% by weight, in terms of oxide. If the titania content is lower than this, the ultraviolet absorption capacity is not sufficient, and conversely, even if a large amount of titania is added so as to exceed the upper limit, there is almost no change from the viewpoint of ultraviolet absorption characteristics, and it is wasted. Is. In addition, although components other than titania and silica may be added to improve various properties, the total amount of titania and silica is at least 80% by weight from the viewpoint of ultraviolet absorption and stability of the glass flake. Must. Other components less than 20% by weight include alumina and zirconia. The titania-silica flake glass of the present invention has an average thickness of 3 microns or less and an average particle size of 1 to 30.
It is preferable that the shape is as uniform as possible in the micron range, more preferably 1 to 15 microns.

The method for producing the titania-silica flake glass used in the present invention is described in, for example, Japanese Patent Application Laid-Open No. 4-4282.
No. 8 or JP-A-4-92832, a sol solution obtained by adding titania fine particles or a compound that produces titania, for example, titanium tetrabutoxide, to a solution containing a silicon alkoxide and reacting the solution. Is applied to a base material, and the flaky gel obtained by drying and peeling is heat-treated. When the heat treatment temperature is low, the flaky gel is insufficiently sintered and remains porous. In this case, because it absorbs moisture from the skin,
The whiteness is lowered, and the skin after makeup becomes rough, which is not preferable. If the heat treatment temperature is raised too high, the flaky gel will be crystallized and the transparency will be lowered. Therefore, the heat treatment of this flaky gel is 6
It is preferable to carry out at a temperature between 00 and 1200 ° C. for 5 to 300 minutes.

Originally, glass means, for example, Ame.
rican Society of Testing a
As defined in nd Materials, it means an amorphous substance obtained by cooling a melt of an inorganic substance to a hard state without crystallization. However, in recent years, as described in JP-A-4-42828, synthesis of an amorphous material by a so-called sol-gel method using a metal alkoxide has become popular. And, for example, a flower (NE
As represented by the literature of W GLASS, No. 9, 1988, pp. 40-), the amorphous body obtained by the sol-gel method is also generally referred to as glass. Therefore, also in the present invention, the glass including the amorphous material produced by such a sol-gel method is called.

The cosmetic containing the titania-silica flake glass of the present invention has a high transparency of the glass flake and hardly absorbs water or oil so that the color does not become dull. After adding a coloring pigment and mixing and pulverizing, a cosmetic having a very good coloring property is obtained.

In the cosmetics of the present invention, in addition to the titania-silica flake glass, pigments that are usually used may be used in combination, if necessary. For example, titanium oxide, zinc oxide, zirconium oxide, yellow iron oxide, black iron oxide, red iron oxide, ultramarine blue, dark blue, chromium oxide, inorganic pigments such as chromium hydroxide, mica titanium, pearlescent pigments such as bismuth oxychloride, tar. Pigments, natural pigments, powders of silica beads, plastic beads such as nylon and acrylic, talc, kaolin, mica, sericite, other mica, magnesium carbonate, calcium carbonate, aluminum silicate, magnesium silicate, clays, etc. It is illustrated.

The amount of the titania-silica flake glass referred to in the present invention varies depending on the kind of the intended cosmetic, but it is 1 to 8 relative to the solid components such as pigments.
It is used in the range of 0%, and particularly preferably in the range of 2 to 50%. If the content is less than this, the ultraviolet absorption effect is not significantly exhibited, and conversely, even if more flaky glass is added than the upper limit, the ultraviolet absorption effect does not increase, other pigment components decrease, and the color tone is reduced. It becomes difficult to condition and improve the adhesion to the skin.

In order to improve the dispersibility of the titania-silica flake glass used in the present invention in cosmetics and to improve the feel, the flake glass is surface-treated and modified. You can do anything.
For example, in addition to methylhydrogen polysiloxane, reactive alkyl polysiloxane, metal soap, hydrogenated lecithin, acyl amino acid, acylated collagen metal salts selected from aluminum, magnesium, calcium, titanium, zinc, zirconium, iron, etc. When a surface treatment with a so-called hydrophobizing agent is performed, the surface of the glass flake changes from hydrophilic to hydrophobic, so that it becomes more familiar with the oil agent added during the preparation of the cosmetic, and the cosmetic has a good feel. .

[0018]

EXAMPLES The present invention will be described in more detail by way of examples. Example 1 Commercially available silicon tetramethoxide, ethanol, and 0.1 N nitric acid were mixed in a volume ratio of 1: 2: 1, and fine particle titania (average particle size 35 nm).
Was mixed so as to be 10% by weight of the amount of the oxide finally obtained, and reacted at 40 ° C. for 20 hours while stirring. The surface of this solution was polished and smoothed to a thickness of 1 m.
A stainless steel plate of m was dipped and pulled up at a constant rate of 40 cm per minute to form a film. Dry it in the air for 5 minutes,
Then, it dried at 100 degreeC for 2 minutes. By this drying, the film applied to the stainless steel plate was completely peeled off and turned into a flake-like gel.

The flaky gel thus obtained was placed in an alumina crucible and heated at a heating rate of 100 ° C./min for 1 hour.
It heated up to 000 degreeC and heat-processed at the temperature for 2 hours. After the heat treatment, it was confirmed by X-ray diffractometry that this flake-like substance was a glass containing rutile type titania.

The average thickness of the titania-silica flake glass was measured with an electron microscope.
It was 0.64 micron. This was pulverized and classified to have an average particle size of 4.5 microns (measured particle size: 1.2 to 20 microns). Further, when the flaky glass was chemically analyzed, it contained 9.5% by weight of titania and 90.5% by weight of silica.

On the other hand, a powder foundation was prepared with the following formulation.

Component-1 Talc 80.0% by weight Mica 9.6 Titanium oxide 2.0 Fine particle titanium oxide 4.0 Magnesium stearate 3.0 Rouge 0.2 Yellow iron oxide 0.5 Black iron oxide 0.1 Silk powder 0.5 Squalane 0.1 To this, 3 parts of the flakes of the present invention produced by the above method were added to 100 parts of the powder of component-1 and mixed and stirred in an alumina ball mill for 2 hours. It was

Component-1 and each of the powders of 0.
22g was collected and the skin of the center of the back of 5 subjects was 4cm.
It was evenly applied to 5 cm adjacent to each other, exposed to direct sunlight for a certain period of time, and then the degree of sunburn was observed.

Table 1 shows the results.
The degree of sunburn of 5 subjects was classified from 1 (nearly sunburn) to 5 (severe sunburn). After 30 minutes, almost no difference was visually observed, but after 1 hour, a remarkable difference was recognized, and the powder containing the titania-silica flake glass according to the present invention was applied. The sunburn of the skin was significantly reduced as compared with the case where the powder of component-1 was applied. Further, the cosmetic of the present invention has less irritation to the skin, spreads well,
It was confirmed that it was difficult to fade.

[0025]

[Table 1] Table-1 ------------------ Powder of the present invention Component-1 powder (Example-1) (Comparative Example-1) ------------------ 30 minutes later 11 -------------. ------------- 1 hour later 1 3 ------------------------------ 2 hours later 25- −−−−−−−−−−−−−−−−−−−−−−−−− 3 hours later 25 −−−−−−−−−−−−−−−−−−−−− −−−−−−

As is clear from the above detailed description of the present invention and Examples and Comparative Examples, according to the present invention, the cosmetics containing the titania-silica flake glass are
A cosmetic that has less irritation to the skin, spreads well, is resistant to fading, and has excellent ultraviolet absorption ability can be obtained.

[0026]

Claims (1)

[Claims] 1. Titania 5 to 80% by weight, silica 2
A cosmetic having a high ultraviolet absorption effect, which contains 0 to 95% by weight of each of the flaky glass made of titania-silica glass and has a total content of titania and silica of at least 80% by weight.